After it moved into two floors of the One International office tower last year, West Coast digital payments giant PayPal (an eBay subsidiary) launched a startup work space, PayPal Start Tank, with much fanfare. This week, Start Tank published its first list of companies. There are 15 of them, comprising 70 people. Several have managed to stay under the radar until now.

CueThink, for example, is social problem-solving for middle school math class. You used to go up to the chalkboard and solve problems in front of the class, remember? Your kids will do that on an iPad with a digital whiteboard and a voiceover.

"Kids, by the way, they love it," said founder Sheela Sethuraman. "This is a medium they've grown up in to share what they know outside of school." The app uses kids' presentations to provide hints for others who are struggling at each stage of a word problem.

Riding on the adoption of Common Core standards and Apple's iPad one-to-one program, CueThink has raised $150,000 in a Phase I SBIR grant through the National Science Foundation. They're applying for the $750,000 Phase II and looking for bridge financing in the interim.

Acquisition Sciences: Founded by Bullhorn veteran and former VC Rob Kornblum, they're backed by Boston-area venture firms Kepha Partners and Arb Ventures (not sure how much or by whom). "We are building technology to make it super easy for consumers to find and use online coupons and discounts," Kornblum says in a video you can find here. "We think we're much bigger than that. We want to help retailers and manufacturers reach consumers on a one to one basis."

The viaNetwork: This is CrunchBase for accelerator managers and investors, plus video. It includes milestone reports and video startup pitches. "We really didn't want to become another network, even though we are viaNetwork," founder Kyle Kilcoyne told me. "We didn't want it to be cluttered with someone updating, 'We're going out to the Greenway for lunch.'"

Twyxter: Craigslist for the enterprise intranet. "If people have good relationships at work they're more likely to stay with the company, to be engaged," co-founder Jay Mixter told me. He and co-founder Tom Ward both worked at Procter & Gamble (Ward was at Gillette).

Wanderu: Kayak.com for ground travel. Founder Polina Raygorodskaya was a 2013 Mass High Tech Woman to Watch. Their area at Start Tank had the highest people-to-square-foot ratio of any I visited, Thursday.

iAgree was a 2012 MassChallenge finalist. "Revolutionizing the legal world by developing software to help clients resolve legal disputes in the most effective way possible" was their tagline at the time. Now it's "Advancing disputes to resolution."

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